-39.09% is the change from 990 to 603
Calculation steps:
[( 603 - 990 ) ÷ 990] x 100 = -39.09%
Formula
Percentage change = [(603 - 990) / 990] x 100
Subtract the new number by the original number
603 - 990 = -387
-387 ÷ 990 = -0.39090909090909093
-0.39090909090909093 x 100 = -39.09%